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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15e2454d020c0048627909866dad51c64aee4d317d0ddbe2d6791d3d6ada00f' 
  AND token = '/HVq6fZyJUsXAYOewlprMmLzIJScxx9V7osKhL9ROwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}